Before Dec. 1906 the Wright brothers were able to sustain 62 pounds/HP, in 1908 only 35 pounds/HP
Good grief.
First, mathematical arguments based on numbers gleaned from newspaper reporters are plain silly.
Second, and most importantly - Given the world's skepticism of the time, if your challenge is at all meaningful it would surely have been raised during the 1908 era. So that we can all see if that's true, please show us the same challenge from 1908 or so and how the Wrights responded.